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Our advanced trauma team was dispatched via aircraft by the London Ambulance Service

London's Air Ambulance

London Ambulance Service said the pedestrian, believed to be in her 70s, suffered "multiple injuries" in the collision and was taken to hospital as a priority.

A spokeswoman for London's Air Ambulance, said: "Our advanced trauma team was dispatched via aircraft by the London Ambulance Service at 09.51 today to reports of a road traffic collision involving a pedestrian and a bus.

"Following treatment the patient was then taken by road, with the London Ambulance Service, to St Mary's Hospital in Paddington escourted by the London's Air Ambulance doctor."

Ed Fordham

Witnesses were shocked to see the helicopter land right outside Parliament

Video footage from witness David Sam Francis shows the dramatic moment the air ambuance - which is only called out to serious incidents - landed on the famous patch of grass in front of the UK's powerhouses.

Doctors with London's Air Ambulance service are highly trained trauma doctors who can even perform surgery on the roadside.

@Lee_B74

An elderly pedestrian was hit by a bus in Parliament Square

A Scotland Yard spokesman said officers were called to Bridge Street, which leads onto Westminster Bridge and lies in between the Houses of Parliament and Portcullis House where MPs offices are, shortly after 9.30am after reports of a collision.

He added: "Officers attended along with the London Ambulance Service and found a woman in her 70s with a leg injury.

"She has been taken to a south London hospital.

David Sam Francis

London's Air Ambulance made a dramatic landing outside the Houses of Parliament